Nested entities in are not rendered correctly [DATAREST-266]

Johannes Hiemer opened DATAREST-266 and commented

I have a nested Object in MongoDB which looks as follows:

@Document
public class Entity extends AbstractDocument {
	
	private String name;
	
	private List<SubEntity> subEntities;

This document has the SubEntity:

public class SubEntity {
	
	private String name;
	
	private Units units;

In this SubEntity we have the class Units, which in turn contains the problematic @DBRef annotations, which do not work.

public class Units {
	
	@DBRef
	private Unit unit;
	
	@DBRef
	private Unit divisor;

When storing a new Dataset in MongoDB, the data is saved correctly.

{
    "_id" : ObjectId("5318e2db4d1a10c59b94cfaa"),
    "name" : "1234",
    "subEntities" : [ 
        {
           "name" : "1234"
            "units" : {}
        }, 
        {
            "name" : "1234"
            "units" : {}
        }, 
        {
           "name" : "1234"
            "units" : {
                "unit" : {
                    "$ref" : "unit",
                    "$id" : ObjectId("531825594d1a10c59b94cfa2")
                }
            }
        },

Calling this dataset via SD REST, the @DBRef relation is not rendered.

{
    "name": "1234",
    "subEntities": [
        {
           "name": "1234",
            "units": { }
        },
        {
            "name": "1234",
            "units": { }
        },
        {
            "name": "1234",
            "units": { }
        },

Referenced from: commits https://github.com/spring-projects/spring-data-rest/commit/c7059e06a52f19a328d18bed486f7405176a1fe4

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